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Exhaust rattle - think it might be the CATS

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHExhaust rattle - think it might be the CATS

Leading reported evidence

Replace stock mufflers

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
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Unsuccessful attempts
1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Performed · outcome unconfirmed · Original poster

Then (as you can see) I replaced the stock mufflers with Fabspeed super cups (so loud and SO AWESOME) and the rattle is still there.

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Exhaust rattle - think it might be the CATS
Frequently discussed work

Replace might might clear it up based

No successful repair reported for this finding.

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Reported fixes
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Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

So, the engine mounts were shot so I thought that replacing might MIGHT clear it up based on the engine being an inch too low.

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Exhaust rattle - think it might be the CATS
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Leading evidence: 'Replace stock mufflers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace might might clear it up based' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Replace might might clear it up based

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

So, the engine mounts were shot so I thought that replacing might MIGHT clear it up based on the engine being an inch too low.

Original post Read captured discussion
Exhaust rattle - think it might be the CATS
Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace might might clear it up based

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

So, the engine mounts were shot so I thought that replacing might MIGHT clear it up based on the engine being an inch too low.

Original post Read captured discussion
Exhaust rattle - think it might be the CATS

Replace stock mufflers

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

Then (as you can see) I replaced the stock mufflers with Fabspeed super cups (so loud and SO AWESOME) and the rattle is still there.

Original post Read captured discussion
Exhaust rattle - think it might be the CATS
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I was hoping to get an opinion or 2 on this. I've had the car a few weeks and there's been a driver's side exhaust rattle. So, the engine mounts were shot so I thought that replacing might MIGHT clear it up based on the engine being an inch too low. Nope. Then (as you can see) I replaced the stock mufflers with Fabspeed super cups (so loud and SO AWESOME) and the rattle is still there. Put the car up on ramps today and tightened down everything I could see, including clamps, flanges, heat shield bolts, etc. I then took a rubber mallet and carefully tapped on things until I got to the cats...and it sounds like somebody is shaking a can of spray paint. Are my cats shot?? Thoughts? It's a 2004 911 C2.

POST 2Original post

I�ll take a post on cat rattles all day before an IMSB rattle, lol. See if you can find someone to loan a used cat and see if the noise goes away. Or you could bypass them. If the cats are bad, a used set, or a new set of 200-cel might be the way to go. The 200-cell supposedly might have a tad less restriction, which means you could gain a HP or 2. It�s also louder.

POST 3Original post

Quotes source post: 17448588

Sorry to hear about that! Happy to help remedy the cat issue with our 200cels, shoot me a PM.

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